WebSVN – Kolibri OS – Blame – /drivers/video/drm/ttm/ttm_bo_manager.c

Rev	Author	Line No.	Line
4075	Serge	1	/**************************************************************************
		2	*
		3	* Copyright (c) 2007-2010 VMware, Inc., Palo Alto, CA., USA
		4	* All Rights Reserved.
		5	*
		6	* Permission is hereby granted, free of charge, to any person obtaining a
		7	* copy of this software and associated documentation files (the
		8	* "Software"), to deal in the Software without restriction, including
		9	* without limitation the rights to use, copy, modify, merge, publish,
		10	* distribute, sub license, and/or sell copies of the Software, and to
		11	* permit persons to whom the Software is furnished to do so, subject to
		12	* the following conditions:
		13	*
		14	* The above copyright notice and this permission notice (including the
		15	* next paragraph) shall be included in all copies or substantial portions
		16	* of the Software.
		17	*
		18	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
		19	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
		20	* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
		21	* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
		22	* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
		23	* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
		24	* USE OR OTHER DEALINGS IN THE SOFTWARE.
		25	*
		26	**************************************************************************/
		27	/*
		28	* Authors: Thomas Hellstrom
		29	*/
		30
		31	#include
		32	#include
		33	#include
		34	#include
		35	#include
		36	#include
		37	#include
		38
		39	/**
		40	* Currently we use a spinlock for the lock, but a mutex may be
		41	* more appropriate to reduce scheduling latency if the range manager
		42	* ends up with very fragmented allocation patterns.
		43	*/
		44
		45	struct ttm_range_manager {
		46	struct drm_mm mm;
		47	spinlock_t lock;
		48	};
		49
		50	static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
		51	struct ttm_buffer_object *bo,
		52	struct ttm_placement *placement,
		53	struct ttm_mem_reg *mem)
		54	{
		55	struct ttm_range_manager rman = (struct ttm_range_manager ) man->priv;
		56	struct drm_mm *mm = &rman->mm;
		57	struct drm_mm_node *node = NULL;
		58	unsigned long lpfn;
		59	int ret;
		60
		61	lpfn = placement->lpfn;
		62	if (!lpfn)
		63	lpfn = man->size;
		64	do {
		65	ret = drm_mm_pre_get(mm);
		66	if (unlikely(ret))
		67	return ret;
		68
		69	spin_lock(&rman->lock);
		70	node = drm_mm_search_free_in_range(mm,
		71	mem->num_pages, mem->page_alignment,
		72	placement->fpfn, lpfn, 1);
		73	if (unlikely(node == NULL)) {
		74	spin_unlock(&rman->lock);
		75	return 0;
		76	}
		77	node = drm_mm_get_block_atomic_range(node, mem->num_pages,
		78	mem->page_alignment,
		79	placement->fpfn,
		80	lpfn);
		81	spin_unlock(&rman->lock);
		82	} while (node == NULL);
		83
		84	mem->mm_node = node;
		85	mem->start = node->start;
		86	return 0;
		87	}
		88
		89	static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
		90	struct ttm_mem_reg *mem)
		91	{
		92	struct ttm_range_manager rman = (struct ttm_range_manager ) man->priv;
		93
		94	if (mem->mm_node) {
		95	spin_lock(&rman->lock);
		96	drm_mm_put_block(mem->mm_node);
		97	spin_unlock(&rman->lock);
		98	mem->mm_node = NULL;
		99	}
		100	}
		101
		102	static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
		103	unsigned long p_size)
		104	{
		105	struct ttm_range_manager *rman;
		106
		107	rman = kzalloc(sizeof(*rman), GFP_KERNEL);
		108	if (!rman)
		109	return -ENOMEM;
		110
		111	drm_mm_init(&rman->mm, 0, p_size);
		112	spin_lock_init(&rman->lock);
		113	man->priv = rman;
		114	return 0;
		115	}
		116
		117	static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
		118	{
		119	struct ttm_range_manager rman = (struct ttm_range_manager ) man->priv;
		120	struct drm_mm *mm = &rman->mm;
		121
		122	spin_lock(&rman->lock);
		123	if (drm_mm_clean(mm)) {
		124	drm_mm_takedown(mm);
		125	spin_unlock(&rman->lock);
		126	kfree(rman);
		127	man->priv = NULL;
		128	return 0;
		129	}
		130	spin_unlock(&rman->lock);
		131	return -EBUSY;
		132	}
		133
		134	static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
		135	const char *prefix)
		136	{
		137	struct ttm_range_manager rman = (struct ttm_range_manager ) man->priv;
		138
		139	spin_lock(&rman->lock);
		140	drm_mm_debug_table(&rman->mm, prefix);
		141	spin_unlock(&rman->lock);
		142	}
		143
		144	const struct ttm_mem_type_manager_func ttm_bo_manager_func = {
		145	ttm_bo_man_init,
		146	ttm_bo_man_takedown,
		147	ttm_bo_man_get_node,
		148	ttm_bo_man_put_node,
		149	ttm_bo_man_debug
		150	};
		151	EXPORT_SYMBOL(ttm_bo_manager_func);

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(root)/drivers/video/drm/ttm/ttm_bo_manager.c @ 6104 – Rev 4075